User Guide for Sennheiser CX 120BT Wireless Headphones

Quick guide from the manual

This guide provides essential instructions for operating your Sennheiser CX 120BT headphones. Before first use, ensure the device is fully charged (approximately 1.5 hours). To pair with a device, hold the power button for 4 seconds until the LED flashes, then select the headphones in your device's Bluetooth menu. The headphones feature a three-button remote for volume, music playback, and call management.

Getting started

The package includes the CX 120BT headphones, a USB charging cable, and silicone ear adapters in sizes S, M, and L. Choose the adapter size that provides the most comfortable and secure fit for your ears. To wear the headphones, place the neckband around your neck and insert the ear canal phones into your ears.

Operation

Switching on/off: Hold the power button for 2 seconds to turn on (3x blue flash) and 4 seconds to turn off (3x red flash).

Pairing: Ensure the headphones are off. Hold the power button for 4 seconds to enter pairing mode. On your Bluetooth device, search for new devices and select 'CX 120BT'. If prompted for a keyword, enter '0000'.

Volume and playback: Use the '+' and '-' buttons on the remote to adjust volume. Use the center button for music and call functions:

• Play/Pause: Press the center button once.
• Next track: Hold the center button for 1 second.
• Previous track: Hold the center button for 1 second (after the track starts).
• Accept call: Press the center button once.
• End call: Press the center button once.
• Reject call: Hold the center button for 1 second.
• Transfer call: Hold the center button for 1 second.

Maintenance

Charging: Connect the provided USB cable to the Micro-USB port on the headphones and the other end to a USB-A power source. A full charge takes approximately 1.5 hours.

Replacing ear adapters: Gently pull the existing silicone adapter off the earphone and push the new size onto the nozzle until it clicks into place.

Safety and compliance

Always keep the product dry and avoid exposure to extreme temperatures. Do not listen at high volumes for extended periods to prevent hearing damage. The product contains magnets; keep a distance of at least 10 cm (3.94 inches) from cardiac pacemakers or implanted defibrillators. Dispose of the product and batteries at designated collection points according to local regulations.